Patent classifications
E
FIXED CONSTRUCTIONS
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E06
DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
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E06C
LADDERS
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E06C1/02
with rigid longitudinal member or members
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E06C1/34
Ladders attached to structures, such as windows, cornices, poles, or the like
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E06C1/36
Ladders suspendable by hooks or the like
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